Jail records show the gunman arrested in the El Paso shooting that left 20 people dead has been booked on capital murder charges.

El Paso County records Sunday showed that 21-year-old Patrick Wood Crusius was booked at the downtown jail in the Texas border city. There was no immediate indication that he had an attorney.

Police say more than two dozen people were also injured in the attack Saturday at an El Paso shopping area.

Authorities are investigating the possibility the shooting was a hate crime. They're working to confirm whether a racist, anti-immigrant screed posted online shortly beforehand was written by Crusius.